Add a LIMIT clause on a SELECT req

models/account_move.py

@@ -116,7 +116,7 @@
                 ('company_id', '=', company.id),
                 ('date_start', '<=', today),
                 ('date_stop', '>=', today),
-            ])
+            ], limit=1)
             if not period:
                 raise exceptions.Warning(_(
                     'No period found around %s in the "%s" company.'